I have experimented with hundreds of note-taking and list-making apps on the web and on my iPhone but never stayed with any one for long. Simplenote was probably the best for simple text based notes and Evernote was the most versatile. But nothing was perfect and all of them lacked one feature or the other.
Things may change though with the introduction of a new app called WorkFlowy. WorkFlowy is a simple note-taking app that makes lists based on bullets and sub-bullets. All your text in WorkFlowy is contained within one giant list that can have multiple nested sub-lists. This may seem counterproductive but real power of WorkFlowy lies in its simplicity.
Check this article on Slate.com for more praise and details.